code: def add_histogram_summary(var, var_name_scope):
      """Just adds a histogram summary for the variable."""
      with tf.name_scope("summaries/" + var_name_scope):
          tf.summary.histogram("histogram", var)
  
file_path: neural-structured-learning/research/a2n/utils.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import gzip
  import tensorflow
label_desc: Use image node_id 3 for calling a global function with example usage: add_histogram_summary(var, var_name_scope) without return types